diff --git a/interface/ri_data.py b/interface/ri_data.py
index 483ae88..c69bc6c 100644
--- a/interface/ri_data.py
+++ b/interface/ri_data.py
@@ -175,9 +175,10 @@ p_node - xml node (parent node)'''
             pt.setAttributeNode(from_attr)
             pts.appendChild(pt)
         p_node.appendChild(pts)
-		# ri_tk_cmd.py use
+
     @staticmethod
     def get_size(dev):
+        # maybe add raid not in Partition.dict
         if Partition.dict.has_key(dev):
             return Partition.dict[dev].size
         return 
@@ -290,12 +291,12 @@ p_node - xml node (parent node) '''
             raids.appendChild(rd)
 
         p_node.appendChild(raids)
-		#ri_tk_cmd.py use
+
     @staticmethod
     def get_size(dev):
-        sz=sys.maxint
-        level=Raid.dict[dev].level
-        active=Raid.dict[dev].active_components
+        sz = sys.maxint
+        level = Raid.dict[dev].level
+        active = Raid.dict[dev].active_components
         for d in active:
             if float(Partition.dict[d].size) < float(sz):
                 sz=float(Partition.dict[d].size)
@@ -303,6 +304,7 @@ p_node - xml node (parent node) '''
             sz=sz*len(active)
             return str(sz)
         elif level == '1':
+            sz=(len(active) * sz) / 2
             return str(sz)
         elif level == '5':
             sz=sz*(len(active)-1)
@@ -358,15 +360,18 @@ class MountPoint:
             if MountPoint.dict.has_key(dev):
                 continue
             MountPoint(dev)
-
+            # adding a raid device, the partition which is raid.active or raid.spare must be deleted 
+            for d in Raid.dict[dev].active_components + Raid.dict[dev].spare_components:
+                if not MountPoint.dict.has_key(d):continue
+                del MountPoint.dict[d]
+                    
         # now process whether a partition or raid was removed
+        # process has been tested. result's only remove raid device
         s1 = set(MountPoint.dict.keys())
         s2 = set(Partition.dict.keys() + Raid.dict.keys())
         for dev in s1-s2:
-            del MountPoint.dict[dev]
-
-        #MountPoint.dict.keys().sort()
-        #print "keys=",MountPoint.dict.keys()
+            if MountPoint.dict.has_key(dev):
+                del MountPoint.dict[dev]
 
     @staticmethod
     def init_from_xml(node):